Magneto-optical head with separate optical paths for error and d

Details Magneto-optical head with separate optical paths for error and d Magneto-optical head with separate optical paths for error and d

1988-01-20

1990-04-17

McElheny, Jr., Donald

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369112, G11B 700

Patent

active

049186752

ABSTRACT:
A magneto-optical head using a laser source unit with a focus error and a tracking error detector in substantially the same optical path as the originating laser beam. In this invention the stored information is derived from the beam reflected by a beam-splitter, while the transmitted light is utilized for generating the tracking error and the focus error signals.

REFERENCES:
patent: 4409631 (1983-10-01), Matsumoto
patent: 4462095 (1984-07-01), Chen
patent: 4504939 (1985-03-01), Eberly
patent: 4558440 (1985-12-01), Tomita
patent: 4599714 (1986-07-01), Endo
patent: 4670869 (1987-06-01), Chen
patent: 4672593 (1987-06-01), Ojima et al.
patent: 4689481 (1987-08-01), Ono
patent: 4695992 (1987-09-01), Aoi
patent: 4721368 (1988-01-01), Deguchi et al.
patent: 4771411 (1988-09-01), Greve
patent: 4785438 (1988-11-01), Mizunoe
patent: 4787076 (1988-11-01), Deguchi et al.

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